STRTOK(3) BSD Library Functions Manual STRTOK(3)NAMEstrtok — string tokens
strtok(char *str, const char *sep);
This interface is obsoleted by strsep(3).
The strtok() function is used to isolate sequential tokens in a null-ter‐
minated string, str. These tokens are separated in the string by at
least one of the characters in sep. The first time that strtok() is
called, str should be specified; subsequent calls, wishing to obtain fur‐
ther tokens from the same string, should pass a null pointer instead.
The separator string, sep, must be supplied each time, and may change
The strtok() function returns a pointer to the beginning of each subse‐
quent token in the string, after replacing the token itself with a NUL
character. When no more tokens remain, a null pointer is returned.
SEE ALSOindex(3), memchr(3), rindex(3), strchr(3), strcspn(3), strpbrk(3),
strrchr(3), strsep(3), strspn(3), strstr(3)STANDARDS
The strtok() function conforms to ANSI X3.159-1989 (“ANSI C89”).
There is no way to get tokens from multiple strings simultaneously.
The System V strtok(), if handed a string containing only delimiter char‐
acters, will not alter the next starting point, so that a call to
strtok() with a different (or empty) delimiter string may return a
non-NULL value. Since this implementation always alters the next start‐
ing point, such a sequence of calls would always return NULL.
3rd Berkeley Distribution February 3, 1994 3rd Berkeley Distribution